Does Putting Batteries In The Freezer Extend Their Life?


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What Temperature is Bad for Lithium Ion Batteries

Lithium-Ion batteries operate normally within a defined temperature range, which ideally is between 15°C and 35°C. Temperatures higher than 35°C will cause battery degradation, whilst temperatures below 15°C will lead to sluggish electro-chemistry which will further decrease power capability.

Battery typeDesired Operating temperatureOperating temperatureCharge advisory
Li-ion15°C to 35°C(59°F to 95°F)0°C to 35°C(32°F to 95°F)No charge permitted below freezing.Good charge/discharge performance at higher temperature but shorter life.
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How To Revive 18650 Lithium Ion battery

18650 Lithium Ion battery is a single cell battery that can we revived using another power source such as Li-Ion charger with analyzer function (also know as charger with wake-up or boost feature), or alternatively if you can’t afford that sort of charger you can try using a second 18650 battery, a working one, that will serve as a power source to the dead one. Remember that the battery is not dead until it is proved to be dead.

For reviving 18650 battery using this alternative method you will need the following tools: digital multimeter, crocodile clips, a working 18650 battery cell, regular Li-Ion charger and safety glasses.

Here is a great video that explains the method of reviving 18650 battery using another 18650 battery as power source:

Download software to get battery health reports

It can be tough to know at a glance just how your

It can be tough to know at a glance just how your battery is doing. Devices like iPhones come with native battery maintenance settings and alerts that provide at least some information, but these diagnostics are harder to find on laptops unless you install them yourself. Here are a couple of battery-monitoring app options for you to consider.

BatteryCare: This extra-lightweight app — designed for Windows computers — provides notifications, CPU/storage temperature readings, discharge cycle monitoring, and lots of handy information all in one place.

Battery Monitor: Made for MacOS, this app shows battery charge in a friendly interface with info on battery health and cycles, alerts, battery temperature readings, and current total capacity.

If you don’t want to download any dedicated

If you don’t want to download any dedicated apps, you still have options available. For example, you can open up PowerShell on your Windows computer and run the command “powercfg /batteryreport,” which will provide you a file path to this somewhat secret report. Copy or drag it to a browser window, and you’ll get a page with full information on your battery, including recent usage, cycle counts, usage history, and more. It doesn’t have the smooth interface of a monitoring app, but you don’t have to download anything extra to get it.

Battery memory effect: Fact or fiction?

The battery memory effect concerns batteries that are regularly charged between 20% and 80% and suggests that the phone might somehow ‘forget’ that extra 40% you routinely ignore.

Lithium batteries, which are in the majority of modern smartphones, do not suffer the battery memory effect, though older nickel-based (NiMH and NiCd) batteries do.

Nickel-based forget their full capacity if they aren’t discharged and charged from 0 to 100%. But, habitually cycling your lithium-ion battery from 0 to 100% will adversely affect its battery life.

Keeping your battery in zone

In ancient, less enlightened times, there was a problem called “battery memory” that caused nickel-metal hydride (NiMH) batteries to “forget” their full charge capacity and start charging at lower and lower levels. This problem doesn’t exist any longer thanks to modern lithium-ion batteries, but it has led to a lot of poor advice and arguments about battery care based on outdated information. It’s time to clear the air.

Contrary to some recommendations, you don’t need to routinely discharge a lithium-ion battery completely and then recharge it to somehow reboot or calibrate it — this is a destructive practice that’s very hard on your battery. Whether or not it’s a smart idea to perform a complete discharge a couple of times a year remains an unanswered question. Generally, the consensus seems to be that letting your battery discharge (without bottoming it out — aim for around 20%) and then charging it when possible is the best practice.

Next, there was a time when users were advised to refrain from keeping their devices plugged in, based on the idea that letting a battery charge to 100% could wear the battery out more quickly. Today, however, modern devices are designed to stop charging at 100%, so keeping them plugged in doesn’t impact the battery’s lifespan, according to Battery University.

As with many battery-related questions, the issue of keeping your laptop plugged in when it’s reached full capacity is hotly debated, so there’s nothing wrong with turning your machine off and unplugging it if you feel more comfortable doing that. But generally speaking, the best thing you can do for your lithium-ion battery is to avoid letting it discharge below 20%. Plug it in and charge it when you can, and then rinse and repeat. The good news is that with modern batteries and systems, there’s really not much else you need to do — outside of anticipating that your battery will eventually start losing its overall capacity.

Finally, if you’re going to store your laptop for an extended time without using it, then discharge or charge it to 50% before putting it away.

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Should I charge my phone overnight?

As a rule, it’s best to avoid, despite the convenience of waking up with a full battery in the morning. Each full charge counts as a ‘cycle’, and your phone is only built to last for a set number. 

If you charge overnight, you are guaranteed to miss when the phone exceeds the magic 80% mark that is best for extended long-term life.

While most modern smartphones have built-in sensors to shut off charging when they hit 100%, if still turned on they will lose a small amount of battery while idle.

What you may get is a “trickle charge” as the charger attempts to keep the phone at 100% as your phone naturally loses on its own charge during the night. This means that your phone is constantly bouncing between a full charge and a little bit below that full charge – 99% to 100% and back again during a longer-than-required charge. It can also heat the phone up, which is also bad for the battery.

So, charging during the day is better than charging overnight.

Your best policy is to have Do Not Disturb and Airplane Mode switched on. Better still, you could completely switch off your phone, but that may not be possible if you rely on it as an alarm or wish to be ready to take calls at all hours. 

Some devices are also set to power up once the cable is connected by default. Even during waking hours, it’s best to catch your phone before it hits 100%, or at least not leave the charger supplying charge to an already full battery for too long. 

If you are leaving it plugged in for a long period of time, removing the case can prevent it over-heating.

If you still need more juice: Battery packs

 A USB battery pack lets you charge your phone on
A USB battery pack lets you charge your phone on the go. Photo: Mark Smirniotis

If, after following these tips, you find that your phone still can’t survive through the day, the battery may be defective; you should take your iPhone to an Apple Store, or contact your Android phone’s vendor, to rule that possibility out. (Some extended warranties for smartphones, including AppleCare+, cover replacing a battery that has declined below a certain amount within the warranty period.)

If the battery is fine, and the phone is less than two or three years old—so you don’t plan on buying a new one with better battery life soon—you might consider purchasing an external battery. These accessories, which can take the form of a bulky case with a built-in battery, or a separate battery that connects to your phone with a cable, provide the power you need to last an additional few hours at the end of the day, or even to fully charge your phone’s battery.

 Our pick for the best iPhone 6 battery case, Anke
Our pick for the best iPhone 6 battery case, Anker’s Ultra Slim Extended Battery Case, offers the most charge for the money. Photo: Nick Guy

Battery cases are popular for iPhones. If you own a current-generation iPhone, we’ve collected picks for the iPhone 6 and 6s, as well as the 6 Plus and 6s Plus; if you’re still using a last-generation model, we’ve assembled recommendations for you in our guide to cases for the iPhone 5 and 5s.

 Batteries so small, you can compare them with a P
Batteries so small, you can compare them with a Post-it note (left to right): the EasyAcc 6,000mAh Ultra Slim Power Bank, the Jackery Bolt, the RAVPower 16,750mAh Portable Charger, and the RAVPower 22,000mAh Ace Series. Two other picks, the TravelCard and the Anker PowerCore 20000 with QC 3.0, are not pictured. Photo: Mark Smirniotis

If you have another type of phone, if you don’t want a bulky battery case, or if you want the flexibility to charge multiple devices, a USB battery pack is a better option. Our guide to the best USB battery packs covers models ranging from pocketable packs that will get you through a meeting or an evening out all the way up to large batteries designed to support you through a week off the grid.

Screenshots by Dan Frakes, Nick Guy, and Kevin Purdy.